Table View not populating - iphone

Question

I know this is an oft-asked question/problem. I've looked through a bunch of Q&A for my problem, but I guess I'm a little thick, because I didn't see an answer anywhere.
I have a file with in an array that I would like to use to populate a tableView.
The problem is that it's not being called. Neither is numberOfRowsInSection or numberOfSectionsInTableView. I far as I can see, only viewDidLoad was called.
I have 1 section, the number of elements in my array equals 3 (as opposed to nil).
Relevant code is here...
- (void)viewDidLoad {
[super viewDidLoad];
FileControl *fileArray = [[FileControl alloc] init];
matArray = [fileArray findUniqueItemsInArray:0 :[fileArray setFileToArray]];
[fileArray release];
NSLog(#"%i \n %#", [matArray count], matArray); // matArray is filled.
NSLog(#"ViewDidLoad"); }
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
NSLog(#"CellForRowAtIndexPath");
NSString *text = [matArray objectAtIndex:[indexPath row]];
[[cell textLabel] setText:text];
return cell; }
#interface MaterialTableViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource> {
IBOutlet UITableView *materialTableView;
NSArray *matArray;
}
#property (nonatomic, retain) NSArray *matArray;
#end
The other methods are standard.
I guess my problem lies in that I don't completely understand the flow well enough.
Any help would be greatly appreciated. Thanks in advance.

Answer 1

Have you set your UIViewController subclass to be the delegate and dataSource of the UITableView in question? Without doing so, none of the methods you mention will be called.

Answer 2

I suppose you are using a UITableViewController.
If you are using UITableView it is a little bit more complicated (in this case you need to implement UITableViewDelegate, UITableViewDataSource protocols).
[update] This is not your case, you are using UITableViewController.
Add this line to the end of your viewDidLoad method:
[self.tableView reloadData];
Or move this:
FileControl *fileArray = [[FileControl alloc] init];
matArray = [fileArray findUniqueItemsInArray:0 :[fileArray setFileToArray]];
[fileArray release];
to the init method. Your init method should look like this:
- (id)initWithStyle:(UITableViewStyle)style {
if ((self = [super initWithStyle:style])) {
FileControl *fileArray = [[FileControl alloc] init];
matArray = [fileArray findUniqueItemsInArray:0 :[fileArray setFileToArray]];
[fileArray release];
NSLog(#"%i \n %#", [matArray count], matArray); // matArray is filled.
NSLog(#"ViewDidLoad");
}
return self;
}
If you do not see any message in the log, it means that you are not using that method to initialize your object.
Please show all your code in the .m and .h files.

Answer 3

I have a suggestion. Just give a shot for a test. In the - (void)viewDidLoad declare this.
instead of : matArray = [fileArray findUniqueItemsInArray:0 :[fileArray setFileToArray]];
Use this: matArray = [[NSArray alloc] initWithArray:[fileArray findUniqueItemsInArray:0 :[fileArray setFileToArray]]];

Answer 4

Did you use
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.matArray count];
}

Answer 5

make sure you have added your tableview delegate to your .h file as shown below.
#interface YourViewController : UIViewController <UITableViewDelegate> {
}
Also make sure that you have connected your datasource and delegate in interface builder.
Do this by doing:
double click on your .xib file so it opens in interface builder.
left click on your tableview just once so its highlighted blue
right click on your tableview now and a menu should pop up.
drag the datasource & delegate to the files owner box.
make sure to save changes while in interface builder.
This should "connect" all the pieces needed to get it to work.
Happy Coding!!